That's exactly the point of the metaphysical problem. And you could rephrase as: if we could make an exact replica of the universe, would it behave just as ours

That's exactly the point of the metaphysical problem. And you could rephrase as: if we could make an exact replica of the universe, would it behave just as ours or would it diverge away? Laplace says it would behave just as ours, but it's not obvious. It's not a question about chaos or the computability of the universe, it's a question about whether true randomness exists in the laws of nature.